A level 11 Fighter makes 3 attacks per Attack action as per:
Beginning at 11th level, you can attack three times, instead of twice, whenever you take the Attack action on your turn.
According to Players’ Handbook, any character can attack with both hands:
When you take the Attack action and attack with a light melee weapon that you’re holding in one hand, you can use a bonus action to attack with a different light melee weapon that you’re holding in the other hand. You don’t add your ability modifier to the damage of the bonus attack, unless that modifier is negative.
If a level 11 Fighter is brandishing a light weapon in each hand, how many attacks do they make per turn?
4: 3 from the Attack action + 1 from the bonus action?
Or 6: 3 from the Attack action + 3 from the Bonus action?